<template>
    <div class="container">
  <div class="page-title">滑动组件</div>
  <ul>
    <li class="list-item " v-for="(item,index) in list " data-type="0">
      <div class="list-box" @touchstart.capture="touchStart" @touchend.capture="touchEnd" @click="skip">
        <img class="list-img" :src="item.imgUrl" alt="">
        <div class="list-content">
          <p class="title">{{item.title}}</p>
          <p class="tips">{{item.tips}}</p>
          <p class="time">{{item.time}}</p>
        </div>
      </div>
      <div class="delete" @click="deleteItem" :data-index="index">删除</div>
    </li>
  </ul>
</div>
</template>  
<script>  
export default{
 name: 'index',
 data () {
 return {
  list : [
  {
   title : 'Chrome更新了' ,
   imgUrl : './static/images/Chrome.png' ,
   tips : '不再支持Flash视频播放' ,
   time : '上午 8:30'
  },
  {
   title : '电影新资讯' ,
   imgUrl : './static/images/Sina.png' ,
   tips : '电影《红海行动》上映以来票房暴涨，很多国人表示对国产电影有了新的改观' ,
   time : '上午 12:00'
  },
        {
   title : '聚焦两会·共筑中国梦' ,
   imgUrl : './static/images/video.png' ,
   tips : '习近平代表的两会故事' ,
   time : '下午 17:45'
        },
        {
   title : '微信团队' ,
   imgUrl : './static/images/Wechat.png' ,
   tips : '您的帐号有异常登录，如非本人操作，请及时修改密码' ,
   time : '昨天'
        }
  ],
  startX : 0 ,
  endX : 0 ,
 }
 },
    methods: {
    //跳转
    skip(){
    if( this.checkSlide() ){
    this.restSlide();
        }else{
    alert('You click the slide!')
        }
    },
    //滑动开始
    touchStart(e){
    // 记录初始位置
    this.startX = e.touches[0].clientX;
    },
    //滑动结束
    touchEnd(e){
                // 当前滑动的父级元素
    let parentElement = e.currentTarget.parentElement;
    // 记录结束位置
    this.endX = e.changedTouches[0].clientX;
                // 左滑
    if( parentElement.dataset.type == 0 && this.startX - this.endX > 30 ){
    this.restSlide();
    parentElement.dataset.type = 1;
    }
                // 右滑
    if( parentElement.dataset.type == 1 && this.startX - this.endX < -30 ){
    this.restSlide();
    parentElement.dataset.type = 0;
    }
    this.startX = 0;
    this.endX = 0;
    },
        //判断当前是否有滑块处于滑动状态
        checkSlide(){
    let listItems = document.querySelectorAll('.list-item');
    for( let i = 0 ; i < listItems.length ; i++){
    if( listItems[i].dataset.type == 1 ) {
    return true;
            }
    }
    return false;
        },
    //复位滑动状态
    restSlide(){
    let listItems = document.querySelectorAll('.list-item');
                // 复位
    for( let i = 0 ; i < listItems.length ; i++){
    listItems[i].dataset.type = 0;
    }
    },
        //删除
        deleteItem(e){
            // 当前索引
            let index = e.currentTarget.dataset.index;
            // 复位
            this.restSlide();
            // 删除
            this.list.splice(index,1);
        },  
    }
}
</script>  
<style>
.container {
    width: 100%;
    overflow-x: hidden;
}
.page-title{
  text-align: center;
  font-size: 17px;
  padding: 10px 15px;
  position: relative;
}
.page-title:after{
  content: " ";
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  height: 1px;
  border-bottom: 1px solid #ccc;
  color: #ccc;
  -webkit-transform-origin: 0 100%;
  transform-origin: 0 100%;
  -webkit-transform: scaleY(0.5);
  transform: scaleY(0.5);
  z-index: 2;
}
.list-item{
  position: relative;
  height: 1.6rem;
  -webkit-transition: all 0.2s;
  transition: all 0.2s;
}
.list-item[data-type="0"]{
  transform: translate3d(0,0,0);
}
.list-item[data-type="1"]{
  transform: translate3d(-2rem,0,0);
}
.list-item:after{
  content: " ";
  position: absolute;
  left: 0.2rem;
  bottom: 0;
  right: 0;
  height: 1px;
  border-bottom: 1px solid #ccc;
  color: #ccc;
  -webkit-transform-origin: 0 100%;
  transform-origin: 0 100%;
  -webkit-transform: scaleY(0.5);
  transform: scaleY(0.5);
  z-index: 2;
}
.list-box{
  padding: 0.2rem;
  background: #fff;
  display: flex;
  align-items: center;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  justify-content: flex-end;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  font-size: 0;
}
.list-item .list-img{
  display: block;
  width: 1rem;
  height: 1rem;
}
.list-item .list-content{
  padding: 0.1rem 0 0.1rem 0.2rem;
  position: relative;
  flex: 1;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  overflow: hidden;
}
.list-item .title{
  display: block;
  color: #333;
  overflow: hidden;
  font-size: 15px;
  font-weight: bold;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.list-item .tips{
  display: block;
  overflow: hidden;
  font-size: 12px;
  color: #999;
  line-height: 20px;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.list-item .time{
  display: block;
  font-size: 12px;
  position: absolute;
  right: 0;
  top: 0.1rem;
  color: #666;
}
.list-item .delete{
  width: 2rem;
  height: 1.6rem;
  background: #ff4949;
  font-size: 17px;
  color: #fff;
  text-align: center;
  line-height: 1.6rem;
  position: absolute;
  top:0;
  right: -2rem;
}
</style>
